Muliple instances of postfix

[nullage]

I saw two ways of implementing multiple instance of postfix.

1. http://edoceo.com/howto/postfix-multiple-instances
2. http://www.postfix.org/MULTI_INSTANCE_README.html

I tried the first one becuase it seemed more attractive to me at first glance, but I think it out of date with how postfix works these days.

I am running a relay service. The point is inbound emails are processed than pushed to another protocol. It is not for sending emails. It works fine. I just want to have other instance like a test instance. basically identical but processing emails send to emails using another domain. I want the instances to be completely separate as to not to disrupt the production service at all.

I'm a little bit unsure of the second solution becuase I'm not sure if is valid for my use case, or how independently these instances are managed. I want them completely separate. I may have to modify the init script an have two separate ones.

I want to avoid vitalisation if I can, just have two or more instance running independently.

I may also want another instance for occasional email sending or other purpose.

[nullage]

Sorry I meant to say I want to avoid virtualization.